underground railroading 

The act of scissoring assholes and transferring shit from one anus to the other

Guy 1: "What did you two do last night?"
Guy 2: "We were underground railroading until our asses overflowed!"

underground railroading by thechocolatestarfish April 28, 2014

underground sport 

A sport heard by many, played by few.

Clay: "Hey Dude! I've seen that before...What they doing there?? 7-on-7 throwing that Frisbee around!" Dude Smith: "Oh Dude! That's Ultimate Frisbee...That's one of those Underground Sports! You gotta be a Bad Ass to play that!!"

underground sport by Ohsider December 23, 2015

underground tweakers 

The type of tweaker that goes behind you and mixes up all your organization, robs you, and/or lurks in the shadows and does the unknown worst kind of ugliness and meaness.

Those underground tweakers took our lawn furniture to Tom's and brought his lawn mower over to our pool for a swim last night.

underground tweakers by Rhodhisian May 29, 2017

underground sense 

The sense that you are get used to the atmosphere by underground transportation especially for the subway. When you get the underground sense, you may feel confused about directions and voices and uncomfortable with the sunlight, etc.

Every time I need a little while to shake off my underground sense before I come to the right exit in the subway station in Shanghai.

underground sense by Hart Bullock November 12, 2017

Underground Subliminal 

Normally a subliminal with controversial Affirmations, But also can be Very Exaggerated, to the point of Harmfulness.
The UG (Underground) Subliminal community is known to be very toxic, But sometimes otherwise. Sometimes people Hide UG affirmations in a subliminal to Harm someone and they usually get Cancelled for it.

Person: Hey! Do you know if Underground Subliminals are safe?
Person 2: Uhh....

Underground Subliminal by st4rr3y eyes June 4, 2023

Underground Monkey 

A positional variation of The Monkey in the Kamasutra where the standard positions are reversed. The female is normally on the bottom, but it's also a term used when two males perform The Monkey

They were totally doing the Underground Monkey after the party.

Underground Monkey by Monkey42 May 28, 2012

underground guidance counselor 

When you a student in high school handout free condoms and possibly literature about safe sex. However the expense is actually being paid by the guidance counsel office (who would get in trouble if they were to hand out free condoms and possibly literature on lgbtttq safe sex).

“I was a underground guidance counselor in high school” said Shelby.
“WTF is that??” asked toriah .
“In high school I would be provided condoms and safe sex pamphlets from the actual guidance counselors in my high school who were scared , that parents would call the school. I would hand the condoms out every Tuesday, and be known as a underground guidance counselor “.

underground guidance counselor by Sprite28 November 4, 2018